docs: def view_pmap(token, dstore):
      """
      Display the mean ProbabilityMap associated to a given source group name
      """
      grp = token.split(':')[1]  # called as pmap:grp
      pmap = {}
      rlzs_assoc = dstore['csm_info'].get_rlzs_assoc()
      pgetter = getters.PmapGetter(dstore, rlzs_assoc)
      pmap = pgetter.get_mean(grp)
      return str(pmap)